<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			let start = new Date().getTime();
			let a = 20;
			console.log(a)
			test1();
			console.log(a)
			
		//	test2();
			function test1(){
				console.log("test1")
				a++;
			}
			
			console.log(a)
			
			var test2 = function(){
				console.log("test2");
				a++;
			}
			console.log(a)
				test2();
			console.log(a)
			let end = new Date().getTime();
			console.log(end - start)
		</script>
	</head>
	<body>
	</body>
</html>
